Documentation: spi-nor: rewrite some portions
Documentation: spi-nor: rewrite some portions

Signed-off-by: Brian Norris <ac73eed4b8a8c9127255a2696c52b2e7503720b8@gmail.com>
Reviewed-by: Marek Vasut <f40600653b33f5282fa4c5daf377dfc444fb4625@denx.de>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs